If you are conerned about nearby objects you only have to model them once.
In the real world most nearby objects can be ignored; most either have
an insignificant effect on an antenna or an effect in one direction only.
If there is a field full of 10M tall poles surrounding you, they will effect
your 40M vertical, but this is not a likely situation.
The time required to get an antenna "right" through modeling is in
general much less than the time it takes through cut and try, even
with things like antenna analyzers and it wastes a lot less material.
NEC
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